Residual land value (RLV) is the most a developer can pay for a site and still hit the return the project needs. You work backwards: start with what the finished development will sell for, deduct every cost of delivering it, deduct the profit the risk has to earn, and the remainder is the land budget.
The subtraction looks simple and is not. Three of the costs you deduct move with the land price you are trying to solve for, so the honest version is iterative. This guide gives you the formula, a reconciled worked example, and the method for handling the circularity the short version hides.
Key Takeaways
- RLV is a negotiation ceiling, not a price and not a valuation. It is the highest figure your own assumptions will support, not a prediction of what the site will sell for.
- The costs you deduct exclude the land purchase price itself. Put the land price into the cost stack and you have deducted it twice, which collapses the answer.
- Duty, land-related interest and margin-scheme GST all depend on the price you are solving for. The subtraction form is a simplification, not a general exact solution.
- RLV, the asking price, comparable-sales market value and a formal valuation are four different numbers, answering four different questions, produced by different people.
What Residual Land Value Actually Answers
A vacant site earns nothing on its own. Its worth comes from what can be built on it, so it can only be valued by reference to a specific scheme: a dwelling count, a product type, a construction cost, a sell-down period.
RLV answers one question from the buyer's side of the table: given this scheme and this required return, what is the most I can pay for this land? Every input is yours, which is why two developers can look at the same parcel and arrive at land values tens of thousands apart while both being arithmetically correct.
That framing sets the direction of the calculation. RLV is a developer setting a ceiling before a negotiation. It is not a method for a landowner deciding whether an offer in their letterbox is fair; that question runs the opposite way, starting from the price on the table and solving for what the project would return.
The Residual Land Value Formula
RLV = GRV − non-land development costs − target profit
- GRV (gross realisation value) is the expected sale proceeds of the finished product, built from settled comparable sales rather than listing prices or projections.
- Non-land development costs are everything required to deliver the project except buying the land: construction and contingency, professional fees, statutory charges and contributions, finance and holding costs, and selling and marketing.
- Target profit is the return the project must earn to justify the risk and the capital tied up in it.
The single most common error: the non-land cost stack does not include the land purchase price. The land is what you are solving for, so adding it to the costs deducted means subtracting it twice. The residual shrinks accordingly, and the mistake is invisible unless you are looking for it.
One GST convention has to be fixed first. Throughout this page the figures are GST-exclusive unless marked otherwise.
Why the Simple Subtraction Is Not the Whole Answer
Three lines in a real feasibility are functions of the land price you are trying to find.
| Price-dependent cost | How it moves as the land price rises |
|---|---|
| Transfer duty | Duty is assessed on the consideration paid for the land, so a higher price means more duty |
| Land-related interest | Interest on the portion of the facility used to buy the land scales with the amount borrowed |
| GST margin scheme, where it applies | The margin is the sale price less the price paid for the land, so a higher land price reduces the GST payable |
The first two push the answer down as the land price rises; the third pushes it up. Land price and these costs are mutually dependent, each an input to the other, and no single subtraction resolves that.
The practical fix is iteration. Solve the residual once, put the resulting land price back into the model, recompute the dependent lines, then solve again. Two or three passes are usually enough for the number to settle. This is what the Goal Seek or iterative-calculation feature in a spreadsheet is doing, and what a month-by-month cashflow model does natively. The subtraction remains useful for screening and for explaining the logic, but it is a simplification, not a general exact solution.
On the third line: the GST margin scheme is a way of calculating GST on a property sale, not a measure of development profit. The Australian Taxation Office states that GST on a property sale is normally one eleventh of the total sale price, and under the margin scheme one eleventh of the margin, where the margin is generally the sale price less either the original purchase price or an approved valuation (ATO, GST and the margin scheme). Eligibility is conditional, and a written agreement to use the scheme must be in place before settlement (ATO, eligibility). Whether it applies to a particular acquisition is a question for your accountant, not for the model.
Worked Example: Three Townhouses in South Australia
The figures below are an illustrative example only. They describe no real site and no real transaction, and they are deliberately round.
Step 1: deduct the non-land costs and the target profit from GRV.
| Item | Amount |
|---|---|
| Gross realisation value (GRV) | $3,000,000 |
| less construction, including contingency | −$1,500,000 |
| less professional fees | −$120,000 |
| less statutory charges and contributions | −$80,000 |
| less finance and holding costs | −$150,000 |
| less selling and marketing | −$150,000 |
| Non-land development costs | −$2,000,000 |
| less target profit | −$400,000 |
| Residual land value (ceiling) | $600,000 |
Step 2: check the answer by running it forwards at a $600,000 land price.
| Reconciliation at a $600,000 land price | Amount |
|---|---|
| Non-land development costs | $2,000,000 |
| Land purchase price | $600,000 |
| Total development cost (TDC) | $2,600,000 |
| GRV | $3,000,000 |
| Profit | $400,000 |
| Margin on cost (profit ÷ TDC) | 15.38% |
| Margin on revenue (profit ÷ GRV) | 13.33% |
The two directions agree: the profit the target asked for is the profit the deal produces. Both margins are shown because they are different numbers. A 15.38% margin on cost is the same outcome as a 13.33% margin on revenue, and the two convert exactly: m = r ÷ (1 − r) = 0.1333 ÷ 0.8667 = 0.1538. This target was set as a dollar profit; if you set it as a percentage, say which denominator you mean, or the number is ambiguous. Our guide to development margin on cost works through that conversion in full.
Sensitivity: How Far the Ceiling Moves
A sensitivity test is a scenario test, not a probability forecast. It asks what happens to the answer if one assumption is wrong, not how likely that is. Move one input at a time, then test the combination.
| Scenario | Profit at a $600,000 land price | Margin on cost | New RLV |
|---|---|---|---|
| Base case | $400,000 | 15.38% | $600,000 |
| Sale prices 8% lower (GRV $2,760,000) | $160,000 | 6.15% | $360,000 |
| Sale prices 8% higher (GRV $3,240,000) | $640,000 | 24.62% | $840,000 |
| Build cost 10% higher (+$150,000) | $250,000 | 9.09% | $450,000 |
Read the first and third rows together. An 8% move in sale prices moves the land ceiling by 40% in the same direction, because the land is the remainder and absorbs the whole change. That gearing is the real output: it tells you how much margin for error you have before the project stops working. Our feasibility sensitivity analysis guide covers the combined stress test and what a negative answer means.
Four Numbers That Are Not the Same Number
These four terms get used interchangeably and they should not be. They are produced by different people, from different evidence, and they routinely disagree.
| Concept | What it is | Who produces it | Whose assumptions |
|---|---|---|---|
| Residual land value | The ceiling implied by one scheme and one target return | The developer | Yours |
| Asking price | What the vendor wants for the site | Vendor or agent | The vendor's |
| Market value | An evidence-based value from comparable land sales | Valuers and agents working from sales evidence | The market's |
| Formal valuation | A professional opinion of market value for a stated purpose | A licensed or certified valuer | Independent, for a defined purpose |
Either RLV or market value can be the higher of the two, and neither is the "real" number. In a competitive market sites can trade above a cautious developer's residual, because other buyers are using thinner margins or more optimistic end values. A feasibility you prepare is also not a valuation, and no lender will treat it as one; a financier typically rebuilds the feasibility on its own valuer's end value and its quantity surveyor's cost estimate before deciding anything. The wider method sits within how a development feasibility is put together, and the cost lines that feed the residual are set out in our development cost breakdown.
Common Errors
- Deducting the land price as a cost. It is the output, not an input. Deducting it double counts the land.
- Subtracting a fixed dollar profit when the target is a margin on cost. If the target is a percentage of cost, the profit required rises as the land price rises, so the two must be solved together.
- Quoting a margin without naming the denominator. Margin on cost and margin on revenue are different figures drawn from identical inputs.
- Working backwards from the asking price. If the scheme is stretched to justify a price already decided, the residual is not evidence of anything.
- Mixing GST bases. GST-inclusive revenue against GST-exclusive costs overstates the residual.
Frequently Asked Questions
Does residual land value include stamp duty?
It depends what you mean by the residual, and you should be explicit about which. Duty is assessed on the price paid for the land, so it is usually calculated as a percentage of the land value you are solving for and folded into the equation rather than deducted as a fixed amount. That is part of why the calculation is circular. Note also that duty is not universal: in South Australia, RevenueSA states that no duty liability arises on a conveyance of non-residential and non-primary production land executed on or after 1 July 2018, so liability depends on the land's use (RevenueSA, Real Property (Land)).
What is the difference between residual land value and market value?
Market value is evidence-based, drawn from what comparable land has actually sold for. RLV is model-based, derived from one developer's scheme, costs and target return. Market value is a statement about the market; RLV is a statement about you. They can differ significantly in either direction.
Should I use margin on cost or margin on revenue?
Use whichever your lender or investment committee uses, and always state which. They are not interchangeable: above, the same profit is 15.38% on cost and 13.33% on revenue. The conversion is m = r ÷ (1 − r), so margin on cost is always the larger figure for a profitable project.
What does a negative residual land value mean?
It means the tested scheme does not work at the assumptions entered: the project cannot afford to pay anything for the land and still hit the target return. A different scheme, a lower cost base, a higher end value or a lower target might all change that, and a site with a negative residual at one dwelling count can be viable at another.
Where to Go Next
Residual land value is one output of a feasibility, not the whole of it. Start with the pillar guide to property development feasibility for how the pieces fit, then work through the cost stack, the margin conversion and the sensitivity testing that sit behind the number.
For the other side of the same negotiation, Cyberate PM, part of the DDDI Group, has written a separate guide from the South Australian landowner's perspective on whether a developer's offer is a fair price. It approaches the question in the opposite direction and is a useful complement to the developer-side method set out here.